Not sure if this is possible, but I want to ask anyways

[Ananaias]

So, I have an idea for my custom game. I don't know if it's possible, but I want to ask. If this has been asked before, I'm sorry. I tried searching, but didn't see anything.

Also, please keep in mind that I am fairly new to this still, so just throwing code at me won't help.

What I want to do:

I have a switch in the game that is needed to move a bookshelf, which reveals a secret passageway. This shelf turns all the lights in the current room off, and essentially forces the player to use their Tinderboxes or Lantern.

However, I have an idea.

Here is a screenshot of the wall where the switch is. It's behind the painting.



On the other side of the player, behind them:



What I want to do:

Upon using the lever behind the painting, I want the room to go completely dark, which I've already managed to do. I would also like to make it so that when the switch is pulled, the bed changes into "bed_simple_movable" with a dead body on it, or even a suitor, with a bloody/very red scene.

However, I don't want it to change until the player turns AROUND. So as he's turning around, it looks normal, but when the player is full turned, it changes, then after a few seconds, goes back to normal.

So, now here's the big question:

Is this possible? And if so, how would I go about doing it? Is there some sort of tutorial I could follow?